An adornment usually in the form of a brooch-like ornament worn on the clothes. It also may refer to items such as a police officers badge of office which may be carried in the form of identification, and worn sewn on to the clothes.

Badge is also slang for a 'vagina'

The police officer polished her badge and remembered the time that strange guy at a party had whispered into her ear asking if she wanted him to give her badge a good licking. How did he know she was a cop?, she wondered. Hadnt he looked kinda strange when she took her wallet out and showed him the badge?

Dave wondered if the girl serving behind the bar would go for it if he asked whether he could bash her badge with his tallywhacker